MediaWiki:Apihelp-query+prefixsearch-extended-description
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Despite the similarity in names, this module is not intended to be equivalent to Special:PrefixIndex; for that, see action=query&list=allpages with the apprefix parameter. The purpose of this module is similar to action=opensearch: to take user input and provide the best-matching titles. Depending on the search engine backend, this might include typo correction, redirect avoidance, or other heuristics.